/*!
 * jQuery gzoom 0.1
 * 2009 Giovanni Battista Lenoci <gianiaz@gianiaz.net>
 * 
 * Based on minizoomPan plugin of Gian Carlo Mingati Version: 1.0 (18-JUNE-2009) http://www.gcmingati.net/wordpress/wp-content/lab/jquery/minizoompan/
 * Inspiration from jquery lightbox plugin http://leandrovieira.com/projects/jquery/lightbox/
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 *
 * Requires:
 * jQuery v1.3.2 or later
 * jQuery ui.core.js v.1.7.1
 * jQuery ui.slider.js v.1.7.1
 * 
 */
jQuery.fn.gzoom = function(settings) {
	settings = jQuery.extend({
  	sW: 10, // small image width
  	sH: 10, // small image height
  	lW: 20, // large image width
  	lH: 20, // large image height
  	step : 5,
  	frameColor: "#cecece",
  	frameWidth: 1,
  	re : /thumbs\//, 
  	replace : '',  
  	debug : false,
  	overlayBgColor : '#000',
    overlayOpacity:0.8,
    containerBorderSize: 10, 
    containerResizeSpeed : 400,
  	loaderContent: "loading...",  // plain text or an image tag eg.: "<img src='yoursite.com/spinner.gif' />"
  	lightbox: false,
  	zoomIcon : "" // icon url, if not empty shown on the right-top corner of the image
	}, settings);

	return this.each(function(){
	  
	  var swapped = false;
	  
		var $div = jQuery(this).css({width: settings.sW, height: settings.sH, border: settings.frameWidth+"px solid "+settings.frameColor, overflow:'hidden'}).addClass("minizoompan");
		$div.wrap('<div class="gzoomwrap"></div>').css({ width:settings.sW });
		var ig = $div.children().css({position: "relative"});
		
		jQuery(window).bind("load", function() {
  		ig.width(settings.sW); 
  		ig.height(settings.sH); 
		});
		
		
		jQuery("<span class='loader'>"+settings.loaderContent+"<\/span>").insertBefore(ig);
		if(settings.zoomIcon != '' && settings.lightbox) {
		  var $zoom = jQuery('<img class="zoomIcon" src="'+settings.zoomIcon+'" alt="view larger" />').insertBefore(ig);
		  $zoom.load(function() {
  		  $zoom.css({'left':(settings.sW - $zoom.width())+'px'}).show();
		  });
		  $zoom.click(function() {
		    drawIface();
		  });
		} else if(settings.lightbox) {
			$div.click(function() {
			  drawIface();
			});
			$div.css({'cursor':'pointer'}); 
		}
		
		var $plus = jQuery('<div class="ui-icon ui-icon-circle-plus gzoombutton">&nbsp;</div>').insertAfter($div);
		var $slider = jQuery('<div class="gzoomSlider"></div>').insertAfter($div).css({ width:(settings.sW-42)+'px'});
		var $minus = jQuery('<div class="ui-icon ui-icon-circle-minus gzoombutton">&nbsp;</div>').insertAfter($div);
		
		$plus.click(function() {
		  valore = parseInt($slider.slider('value')) + settings.step;
		  $slider.slider('value', valore);
		});
		
		$minus.click(function() {
		  valore = parseInt($slider.slider('value')) - settings.step;
		  $slider.slider('value', valore);
		});
		
		$slider.slider({value:0,
		            		min: 0,
		            		max: 100,
		            		step: settings.step, 
                    change: function(event, ui) { 
                    
                      if(!swapped) {
	              				var hiSrc = ig.attr("src").replace(settings.re, settings.replace);
	              				swapImage(ig, hiSrc);
	              				$div.children("span.loader").fadeIn(250);
	                      swapped = true;
	                    }
	                    
                      val = ui.value;

                      newWidth = settings.sW+((settings.lW-settings.sW)*val)/100;
                      newHeight = settings.sH+((settings.lH-settings.sH)*val)/100;
                      ig_pos = ig.position();

                      if(settings.debug && typeof(console) != 'undefined') {
                        console.log('new dimensions:'+newWidth+'x'+newHeight);
                      }
                      
                      deltaWidth = ig.width()-settings.sW;
                      leftPos = Math.abs(ig_pos.left);
                      leftFactor = leftPos/deltaWidth;
                      newDeltaWidth = newWidth-settings.sW;
                      newLeft = (leftFactor*newDeltaWidth)*-1;
                      
                      deltaHeight = ig.height()-settings.sH;
                      topPos = Math.abs(ig_pos.top);
                      topFactor = topPos/deltaHeight;
                      newDeltaHeight = newHeight-settings.sH;
                      newTop = (topFactor*newDeltaHeight)*-1;
              				ig.css({ width: newWidth, height: newHeight, left:newLeft, top:newTop});
                    }
               		});
		$('<br style="clear:both" />').insertAfter($plus);
		
		function swapImage(param, uri){
			param.load(function () {
				$div.children("span.loader").fadeOut(250);
			}).error(function (){
  			alert("Image does not exist or its SRC is not correct.");
			}).attr('src', uri);
		}
		
		$div.mousemove(function(e){
			var divWidth = $div.width();
			var divHeight = $div.height();
			var igW = ig.width();
			var igH = ig.height();
			var dOs = $div.offset();
			var leftPan = (e.pageX - dOs.left) * (divWidth - igW) / (divWidth+settings.frameWidth*2);
			var topPan = (e.pageY - dOs.top) * (divHeight - igH) / (divHeight+settings.frameWidth*2);

      if(settings.debug && typeof(console) != 'undefined') {
			  console.log('left:'+leftPan+'|Top:'+topPan);
			}
			
			ig.css({left: leftPan, top: topPan});			
		});    
		
		if(typeof($.event.special.mousewheel) != 'undefined') {
			ig.mousewheel(function(event, delta) {
	      if (delta > 0) {
	        valore = parseInt($slider.slider('value')) + settings.step;
	  		  $slider.slider('value', valore);
	  		} else if (delta < 0) {
	  		  valore = parseInt($slider.slider('value')) - settings.step;
		  	  $slider.slider('value', valore);
		  	}
	      return false; // prevent default
	    });
	  }
		
		function resize_fx(intImageWidth,intImageHeight) {
		
      if(settings.debug && typeof(console) != 'undefined') {
        console.log('resize_fx('+intImageWidth+','+intImageHeight+')');
      }

			if(intImageWidth > ($(window).width()*80/100)) {
  			imgWidth = $(window).width()*80/100;
  			intImageHeight = (imgWidth/intImageWidth)*intImageHeight;
  			$('#zoomedimage').css({'width': imgWidth+'px', 'height':intImageHeight});
	      if(settings.debug && typeof(console) != 'undefined') {
	        console.log('Img dimensions 80% horizontal:'+imgWidth+'x'+intImageHeight);
	      }
			} else {
  			imgWidth = intImageWidth;
			}
			
			if(intImageHeight > $(window).height()*80/100) {
			  imgHeight = $(window).height()*80/100;
			  imgWidth = (imgHeight/intImageHeight)*imgWidth;
  			$('#zoomedimage').css({'width': imgWidth+'px', 'height':imgHeight});
	      if(settings.debug && typeof(console) != 'undefined') {
	        console.log('Img dimensions 80% vertical:'+imgWidth+'x'+imgHeight);
	      }
			} else {
			  imgHeight = intImageHeight;
			}
			
      if(settings.debug && typeof(console) != 'undefined') {
        console.log('Img dimensions:'+imgWidth+'x'+imgHeight);
      }
			
			// Get current width and height
			var intCurrentWidth = $('#imagebox').width();
			var intCurrentHeight = $('#imagebox').height();
			// Get the width and height of the selected image plus the padding
			var intWidth = (imgWidth + (settings.containerBorderSize * 2)); // Plus the imageŽs width and the left and right padding value
			var intHeight = (imgHeight + (settings.containerBorderSize * 2)); // Plus the imageŽs height and the left and right padding value

    
			
			// Diferences
			var intDiffW = intCurrentWidth - intWidth;
			var intDiffH = intCurrentHeight - intHeight;
			// Perfomance the effect
			$('#imagebox').animate({ width: intWidth, height: intHeight },settings.containerResizeSpeed,function() { _show_image(); });
			if ( ( intDiffW == 0 ) && ( intDiffH == 0 ) ) {
				if ( $.browser.msie ) {
					___pause(250);
				} else {
					___pause(100);	
				}
			} 
			$('#lboximgdatacontainer').css({ width: imgWidth });
		};
		
		function drawIface() {
		
			$('body').append('<div id="gzoomoverlay"></div><div id="gzoomlbox"><div id="imagebox"><div id="gzoom-cont-img"><img id="zoomedimage"><div id="gzoomloading"><a href="#" id="gzoomloadinglink"><img src="images/loading.gif"></a></div></div></div><div id="gzoomlbox-con-imgdata"><div id="lboximgdatacontainer"><div id="gzoomlbox-image-details"><span id="gzoom-image-caption"></span></div></div></div></div>');	
		
			$('#gzoomoverlay').css({
				backgroundColor:	settings.overlayBgColor,
				opacity:			settings.overlayOpacity,
				width:				$(window).width(),
				height:				$(document).height()
			}).fadeIn();
			
			// Calculate top and left offset for the gzoomlbox div object and show it
			$('#gzoomlbox').css({
				top:	$(window).scrollTop() + ($(window).height() / 10),
				left:	$(window).scrollLeft()
			}).show();
			
			$('#gzoomoverlay,#gzoomlbox').click(function() {
				close();									
			});
			// If window was resized, calculate the new overlay dimensions
			$(window).resize(function() {
				$('#gzoomoverlay').css({
					width:		$(window).width(),
					height:		$(window).height()
				});
				// Calculate top and left offset for the jquery-lightbox div object and show it
				$('#gzoomlbox').css({
					top:	$(window).scrollTop() + ($(window).height() / 10),
					left:	$(window).scrollLeft()
				});
			});
			
			_set_image_to_view();
		}

		function _set_image_to_view() { // show the loading
			// Show the loading
			$('#gzoomlbox-con-imgdata').hide();
			$('#zoomedimage').hide();
			$('#gzoomloading').show();
			// Image preload process
			var objImagePreloader = new Image();
      if(!swapped) {
				var hiSrc = ig.attr("src").replace(settings.re, settings.replace);
		  } else {
				var hiSrc = ig.attr("src").replace(settings.re, settings.replace);
		  }
			objImagePreloader.onload = function() {
				$('#zoomedimage').attr('src',hiSrc);
				resize_fx(objImagePreloader.width,objImagePreloader.height);
			};
		  objImagePreloader.src = hiSrc;
		};

		function _show_image() {
 			$('#gzoomloading').hide();
			$('#zoomedimage').fadeIn(function() {
				_show_image_data();
			});
		};

		/**
		 * Show the image information
		 *
		 */
		function _show_image_data() {
			$('#lightbox-loading').hide();
      $('#gzoom-image-caption').html(ig.attr('title'));
			$('#gzoomlbox-con-imgdata').slideDown('fast');
		}
		
		function close() {
			$('#gzoomlbox').remove();
			$('#gzoomoverlay').fadeOut(function() { $('#gzoomoverlay').remove(); });
			$('embed, object, select').css({ 'visibility' : 'visible' });
		}

    function ___pause(ms) {
  		var date = new Date(); 
	  	curDate = null;
		  do { var curDate = new Date(); }
  		while ( curDate - date < ms);
	  };
		
	});	
	
};